flodquist



2 Sheets-Sheet 1.

(No Model.)

0. W. PLODQUIST. APPARATUS'POR THB. MANUFAGTURB oF cELLULosE. No.525,540.

Patented Sept. 4, 1894.

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No Model.) 2 Sheets-Sheet 2.

C. W. FLODQUIST. APPARATUS PoR THB MANUFAGTURB 0F cELLULosB.

No. 525,540. Patented Sept. 4, 1894.

FISQ.

M/MJD UNITED STATES i PATENT OFFICE.

CARL WALDEMAR FLODQUIST, OF STOCKHOLM, SWEDEN.

APPARATUS FOR THE MANUFACTU RE OF CELL'U LOSE.

p SPECIFICATION forming part of Letters Patent No. 525,540, datedSeptember 4, 1894.

Application filed March 8, 1893.

To a/ZZ whom it may concern:

Beitknown that I, CARL WALDEMAR FLoD- QUIST, a subject of the King ofSweden and Norway, residing in Stockholm, in the Kingdom of Sweden, haveinvented certain new and useful Improvements in Apparatus for theManufacture of Cellulose, of which the following is a specification.

My invention relates to boilers used in the manufacture of sulphitecellulose, wherein the wood fibers or particles must be boiled ordigested.

In'the production of sulphite cellulose, the boiling has hitherto, ingeneral, been effected by means of steam in such a way that the steamhas been conducted either into the boiler itself, or into a casingsurrounding the boiler. The rst method has the inconvenience that theboiling lye is diluted, whereby the boiling is retarded and alsorendered unequal, as the lye will be mainly diluted in the top layer ofthe mass. The latter method requires, on the otherhand, ajacket orcasing strong enough to resist a considerable pressure, as rapid boilingrequires atemperature of the steam which ought not to be below 150ocentigrade. Such a casing is expensive, particularly if, as is almostnecessary, it is made in parts which can be separated in order that theboiler shall be accessible from without. The use of the presentapparatus implies, on the contrary, no dilution of the lye, requires nostrongcasing, one of the weakest kind being suicient, and still theboiling maybe effected at a temperature far higher than that rstmentioned. This apparatus employs a jacket, and hot air instead of steamfor the boiling. The air is heated to the desired temperature, say 300centigrade by means of a suitable heating apparatus, and is led into thecasing or jacket surrounding the boiler at one end of the former; itflows through the jacketspace and is let out at the other end of thecasing, whence it is conducted either into the open air, or back to theheating apparatus. The air need not be pure, Abut may be mixed with, orsubstituted by gases, as for instance those from the furnace in theheating apparatus, provided these gases are only so pure as not to causesuch a deposit of soot, or the like, in the casing, as to render afrequent cleaning of the same necessary. As the hot Serial No. 465,161.(No model.)

to the boiler and to each other that they may be easily taken apart, allparts of the boiler shell being thus made readily accessible fromwithout. The boiler may have a cylindrical shape and the joints of theeasing may extend either transversely or longitudinally, but preferablythe former.

In the accompanying drawings I have shown an embodiment of theinvention.

Figure 1 is a longitudinal, axial section of the apparatus. Fig. 2 is anend elevation of the left-hand end of the apparatus seen in Fig. l. Fig.3 is a transverse, vertical section on line 3, 3, in Fig. l, atl theright-hand end of the casing seen in Fig. l. Fig. 4 is a detail view ofthe angle-irons in the jacket-space between the boiler and casing.

.A represents the cylindrical boiler, which is provided with tubularjournals, B, at its ends. These journals have rotative bearings inpillow blocks, C. The boiler maybe rotated through the medium of aworm-wheel, D, seen on the journal B at the left-hand end in Fig. 1, anda worm or screw, D. The boiler is furnished with a manhole, N, and has asteam-gage pipe, L, which latter enters the boiler through the hollow ofa journal B.

The boiler is inclosed ina casing or jacket, the body, E, of which issecured tothe boiler through the medium of angle-irons, c', one of whichis seen detached in Fig. 4. These angle-irons form distancing pieces andoccupy the jacket-space, sc, about the boiler. In order to prevent orretard radiation of heatl from the jacket-space the jacket or casing ismade double, that is ot' two shells, a and b, one Within the other, andthe space between them is filled with some non-conducting material, c,as asbestos, mineral wool, &c.

The construction of the casing, as illustrated, is as follows: I-irons,d, are bent in the form of hoops or rings and extend roundwise of thejacket; and the inner series of plates, a, rest on the outer faces ofthe inner flanges of the rings d; the outer series of plates rest on theouter faces of the outer of the casing is non-rotative and has Ain it a`collar, e, which embraces the rotating journal of the boiler. This endportion of the casing is made of two sets of plates with interposednon-conducting material, similar to the body portion, and tits snugly upto an end-ring, d', on the latter at y, where the joint between therotating and non-rotating parts is situated. At this point the body E isfurnished with a circular bearing lip or flange, d2, which projects toform a rabbet which receives the adjacent margin of the non-rotativeend-portion EX. The ring d', is supported by struts, cl3, the bases ofwhich rest on the shell of the boiler. The hot air or gas enters the.jacket-space through the end-portion EX, by way of a pipe, H, flowsthrough the j acket-space and escapes through the end-portion E', of thecasing to abreeching, N', and outlet pipe, H'.

At the end of the apparatus seen at the right in Fig. l, the end-portionE' of the casing is continuous with the body-portion E, and of courserotates with the latter. In this end-portion are a number of apertures,o, for the escape of the hot gases from the jacketspace into thestationary breeching N', whichA fits up snugly to the apertured face ofthe end-portion E', inclosing said apertures; said breeching closelyembraces the journal B.

In the construction shown the I-irons d extend roundwise of the casing,like hoops, as stated, but it will readily be understood by any oneskilled in the manufacture of such structures how they might be made toextend longitudinally of the casing, the plates a and b then formingsegments of the cylinder.

As it is not important that the joints shall be steam tight, or thecasing be able to withstand anynotable internal pressure, the plates aand b may be quite thin, and each plate may extend only part way roundthe cylindrical casing; or in other words, the plat extending about thecasing may each be made up of- Aseveral segments secured together attheir edges.

Having thus described my invention, I claim- 1. The combination with therotatvely mounted boiler having a jacket or casing, the. body portion ofwhich is secured to and ro. tates with the boiler, of the non-rotativeendportion EX, of the casing, fitting closely to the end of the body ofthe casing, the said casing being provided at its respective endl withan inlet and outlet for said gases, substantially as set forth.

2. The combination with a rotatively 7c mounted boiler havinga jacket orcasing, the body portion of which is secured to and rotates with theboiler and is provided with aperturcs o, in its end, of the stationarybreeching N', at the end of the casing and inclol- .15 ing saidapertures, said breeching being provided with an outlet for gases, asset forth.

3. The combination with the rotativlalyV mounted boiler A, having hollowjournals to provide access for determining the internal 8o pressure, ofthe casing E, EX, E', about slid boiler, said casing having an inlet forhot gases at one end and an outlet for said gasa. at the other end,substantially as set forth.

4. The combination with the boiler, of the l5 non-conducting casingE,comprisinga Serin of ring-like, flanged I-'irons, d, an inner seriesof plates a, resting on and secured tothe outer faces of the innerflanges on said irong,

the outer series of plates b, resting on and It d4

